Idea: Find a heisenbug via binary search. Insert debug instrumentation across only half the output, run, repeat. May be multicausal though.
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In that case, use an independent half each time and afterwards mark the parts that produce changes in behavior. Then group/plot by callpath.
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Ideally, the affected parts will lie along the same callpath. (Depends on the type of debug information, yadda yadda, much work in practice)